33621145 has 4 divisors (see below), whose sum is σ = 40345380. Its totient is φ = 26896912.

The previous prime is 33621113. The next prime is 33621149. The reversal of 33621145 is 54112633.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25532809 + 8088336 = 5053^2 + 2844^2 .

It is a cyclic number.

It is not a de Polignac number, because 33621145 - 2⁵ = 33621113 is a prime.

It is a super-2 number, since 2×33621145² = 2260762782222050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (33621149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3362110 + ... + 3362119.

It is an arithmetic number, because the mean of its divisors is an integer number (10086345).

Almost surely, 2^33621145 is an apocalyptic number.

It is an amenable number.

33621145 is a deficient number, since it is larger than the sum of its proper divisors (6724235).

33621145 is an equidigital number, since it uses as much as digits as its factorization.

33621145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6724234.

The product of its digits is 2160, while the sum is 25.

The square root of 33621145 is about 5798.3743411408. The cubic root of 33621145 is about 322.7534053848.

Adding to 33621145 its reverse (54112633), we get a palindrome (87733778).

The spelling of 33621145 in words is "thirty-three million, six hundred twenty-one thousand, one hundred forty-five".